Solve the problem.Mardi received an inheritance of 
. She invested part at 9% and deposited the remainder in tax-free bonds at 8%. Her total annual income from the investments was 
. Find the amount invested at 9%.
A. $30,000
B. $63,800
C. $60,000
D. $59,000
Answer: C
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Use a graphing calculator to graph the polar equation. Make sure that you choose a sufficiently large interval for the parameter so that the entire curve is drawn.r = 1 + 4 cos(?/4)
A. 
B. 
C. 
D. 
Find a counterexample to show that the statement is false.If a number is multiplied by itself, the result is greater than 0.
A. The number is 1.
B. The number is 
.
C. The number is 0.1.
D. The number is 0.
Solve the problem.From a point on a river, two boats are driven in opposite directions, one at 6 miles per hour and the other at 12 miles per hour. In how many hours will they be 54 miles apart?
A. 1 hr B. 4 hr C. 5 hr D. 3 hr
Provide an appropriate response.For any augmented matrix of a system of linear equations, which of the following row transformations will not necessarily result in a matrix of an equivalent system?(i)Adding to the elements of any row a multiple of the corresponding elements of another row.(ii)Interchanging any two columns.(iii)Multiplying the elements of any row by the corresponding elements of another row.(iv)Multiplying the elements of any row by any nonzero number.
A. (i), (iv) B. (ii), (iii), (iv) C. (ii), (iii) D. (ii)